What Chemicals Used for Stone Wall Cleaning


Postby chasbotfield » Tue Aug 16, 2016 5:10 pm

I have 3 stone buildings in France. Recently I have been visited by a couple of "traders" offering wall cleaning services. I don't especially trust unsolicited callers but let one of these spray a small part of a wall with a chemical. This stuff was magic. Within 30 seconds the sandstone faces had changed from blackened by age/mould etc to clean and yellow. I didn't take them up on their kind offer but would like to know what chemical they were using so I can do it myself. Anyone out there know?
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